 - trigger --subsystem-match=usb/usb_device

 - test (now fixed) /dev/tape/ links

 - move udevadm -> --bindir

 - have a $attrs{} ?

 - kill rules_generator

 - kill tabs?

 - deprecate and warn about RUN+="socket:"

 - libudev.so.1
     - symbol versioning
     - return object with *_unref()
     - udev_monitor_from_socket()
     - udev_queue_get_failed_list_entry()

